Chicks sort of sneezing

my 5 week old chicks have been sneezing but not like they are sick. They seem to be acting normally e.g. eating, drinking etc. but 2 of them are sneezing. not like hard atchoo sneeze, but more like a puff of air sneeze. can someone help.

my 5 week old chicks have been sneezing but not like they are sick. They seem to be acting normally e.g. eating, drinking etc. but 2 of them are sneezing. not like hard atchoo sneeze, but more like a puff of air sneeze. can someone help.